SUNRPC: Use RCU to dereference the rpc_clnt.cl_xprt field
A migration event will replace the rpc_xprt used by an rpc_clnt. To
ensure this can be done safely, all references to cl_xprt must now use
a form of rcu_dereference().
Special care is taken with rpc_peeraddr2str(), which returns a pointer
to memory whose lifetime is the same as the rpc_xprt.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[ cel: fix lockdep splats and layering violations ]
[ cel: forward ported to 3.4 ]
[ cel: remove rpc_max_reqs(), add rpc_net_ns() ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index cb2e564..d3ad81f 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -799,7 +799,7 @@
static void gss_pipes_dentries_destroy_net(struct rpc_clnt *clnt,
struct rpc_auth *auth)
{
- struct net *net = clnt->cl_xprt->xprt_net;
+ struct net *net = rpc_net_ns(clnt);
struct super_block *sb;
sb = rpc_get_sb_net(net);
@@ -813,7 +813,7 @@
static int gss_pipes_dentries_create_net(struct rpc_clnt *clnt,
struct rpc_auth *auth)
{
- struct net *net = clnt->cl_xprt->xprt_net;
+ struct net *net = rpc_net_ns(clnt);
struct super_block *sb;
int err = 0;